spiral

/ˈspaɪərəl/

noun

1.

(geometry) one of several plane curves formed by a point winding about a fixed point at an ever-increasing distance from it. Polar equation of Archimedes spiral:r = aθ; of logarithmic spiral: log r = aθ; of hyperbolic spiral:rθ = a, (where a is a constant)

spiral spi·ral (spī'rəl)adj. Coiling or developing around an axis in a constantly changing series of planes; helical. n. A structure in the shape of a coil. v.spi·raled or spi·ralled, spi·ral·ing or spi·ral·ling, spi·rals or spi·rals To take the form or course of a spiral.